Does this inventory have a bar? Bar is the draggable red thing, found for example on chests,
that limits the portion of the inventory that may be manipulated by machines.

Note: "Having a bar" doesn't mean that the bar is set to some nontrivial value. Having a bar
means the inventory supports having this limit at all. The character's inventory is an
example of an inventory without a bar; the wooden chest's inventory is an example of one
with a bar.